EP1609012B1 - Verteilerschrank für glasfaserkabel - Google Patents

Verteilerschrank für glasfaserkabel Download PDF

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Publication number
EP1609012B1
EP1609012B1 EP04724642.6A EP04724642A EP1609012B1 EP 1609012 B1 EP1609012 B1 EP 1609012B1 EP 04724642 A EP04724642 A EP 04724642A EP 1609012 B1 EP1609012 B1 EP 1609012B1
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EP
European Patent Office
Prior art keywords
flexibility
fibre
suite
blown
array
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04724642.6A
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English (en)
French (fr)
Other versions
EP1609012A1 (de
Inventor
Philip Alfred Bakerr
John Kerry
Christopher Charles Taylor
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British Telecommunications PLC
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British Telecommunications PLC
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Filing date
Publication date
Priority claimed from GB0307394A external-priority patent/GB0307394D0/en
Priority claimed from GB0322490A external-priority patent/GB0322490D0/en
Application filed by British Telecommunications PLC filed Critical British Telecommunications PLC
Publication of EP1609012A1 publication Critical patent/EP1609012A1/de
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Publication of EP1609012B1 publication Critical patent/EP1609012B1/de
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/444—Systems or boxes with surplus lengths
    • G02B6/4452—Distribution frames
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
    • G02B6/52—Underground or underwater installation; Installation through tubing, conduits or ducts using fluid, e.g. air
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/444—Systems or boxes with surplus lengths
    • G02B6/4452—Distribution frames
    • G02B6/44526—Panels or rackmounts covering a whole width of the frame or rack
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/14—Distribution frames
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/444—Systems or boxes with surplus lengths
    • G02B6/44528—Patch-cords; Connector arrangements in the system or in the box
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4471—Terminating devices ; Cable clamps
    • G02B6/4478—Bending relief means

Definitions

  • This invention relates to telecommunications exchange or router installations and to methods of creating connections and re-routing connections in such installations.
  • a typical telecommunications exchange building houses a large variety and quantity of equipment such as switches, typically on equipment racks, and connected by cables to and from each other and to the external telecommunications network.
  • the trunk parts of telecommunications networks are nowadays commonly all-fibre.
  • optical fibre use extends into the access network, with fibre-to-the kerb, fibre-to-the-cabinet and even fibre-to-the premises. Consequently, virtually all modern telephone exchange installations involve a considerable proportion of fibre circuits rather than wired circuits. Because optical fibre is sensitive both to bend and strain, management of the optical interconnections within an exchange installation is important.
  • optical fibre plant within an exchange or router building
  • One of the main functions of optical fibre plant within an exchange or router building is to manage and route fibres from a particular set of optical equipment to fibres from, for example, an incoming cable from the external telecommunications network.
  • optical fibre is deployed more abundantly and more generally in the network, the routing and patching of such fibre, especially within exchanges, is becoming increasingly troublesome.
  • Major problems are the growth in the amount of equipment and the sheer number of connections required. These problems are exacerbated by growth, upgrading and changes within the exchange which result in the need to interconnect new equipment or systems.
  • additional cables may be added and the new equipment or system will almost certainly be in a different physical location from the old, and in any event will typically need moving or different connections to be made.
  • OFRs Optical Flexibility Racks
  • OFRs can carry hundreds of individually spliced fibres but when they are fully populated, as is often the case, there is severe congestion at the OFRs. It is often difficult to identify, locate and isolate individual fibres in such cases when re-routing of the cable path is necessary, making the task both time-consuming and complicated.
  • Another problem resulting from fibre overcrowding is that fibres are routed across each other in close proximity so that the combined weight presses down on fibres located near the base of OFRs, increasing the risk of circuit failure through increased optical loss and even of fibre breakage. This problem becomes even more critical as higher bit rate systems are employed, as these tend to be more sensitive to increases in optical loss.
  • optical fibre cabling its routing and supporting structures such as OFRs take up a significant portion of the total cost, time and effort of installing and cabling a telecommunications exchange system.
  • the current methods to interconnect exchange equipment, or to connect an incoming cable to a rack of exchange equipment typically involve several lengths of optical fibre connected end to end either by means of connectors or splices, or a combination thereof.
  • the path taken by the fibre from the incoming cable to an equipment rack could involve a significant number of connections or splices, especially if the destination equipment rack is physically distant from the incoming cable, for example if the equipment sits on a separate floor from the incoming cable within the exchange building.
  • EP 0679610 describes a system for guiding optical fibres in an orderly way to interconnect the fibres with apparatus housed in banks. This is carried out by guiding tubes to a desired bank via connector blocks.
  • the present invention provides a blown fibre tube flexibility suite r according to anyone of the claims 1-7 for routing optical fibres within a telecommunications switch installation between an incoming cable and one of a plurality of equipment racks, whereby the flexibility suite comprises:
  • Such an arrangement facilitates the use of blown fibre in an exchange setting. This arrangement also facilitates the provision of new paths through the re-use of existing partial paths simply by changing the choice of "patches" made between the second and third arrays.
  • the second set of conduits will be formed by the bores of double-ended connectors.
  • the first set of conduits will often be formed by the bores of double-ended connectors.
  • the connectors are push-fit connectors which provide a sealing grip about or within the tubes which are used between flexibility suites, to switches or routers and as patch tubes. Such connectors are particularly good at facilitating the rapid commissioning or re-commissioning of tube paths.
  • the present invention provides a telecommunications switch or router installation comprising; a telecommunications switch or router connected to an optical fibre of an optical fibre cable which itself is connected to and incoming from an external telecommunications network; a first and at least one second flexibility suite according to the first aspect of the invention; a tubular sub-path being defined through each of the flexibility suites from the first array to the fourth array via an interconnection between the second and third arrays; the fourth array of the first flexibility suite being interconnected with the first array of the or one of the second flexibility suite(s); a tubular pathway being provided between the fourth array of the second flexibility suite or the last of the second flexibility suites and the switch or router; the other second flexibility suites, if any, being interconnected in series with the first array of each of subsequent second flexibility suite being interconnected with the fourth array of the preceding second flexibility suite by means of a patch tube, so that a substantially continuous path is provided for installation of a blown-fibre member between the first flexibility suite and the switch or router.
  • the invention provides a method of creating a connection in a telecommunications switch installation, between a telecommunications switch, and an optical fibre of an incoming cable connected to and incoming from a telecommunications network, terminated at a first flexibility suite, comprising the steps of:
  • the present invention provides a method of re-routing an existing connection in a telecommunications switch installation from a connection between a first telecommunications switch and a first flexibility suite according to any one of claims 1 to 7, to create a connection between a second telecommunications switch and the first flexibility suite comprising the steps of:
  • Figure 1 shows a typical layout of the current exchange installation of a particular equipment rack (2) within an exchange building, connected to an incoming cable (5).
  • an "incoming cable” includes any cable which enters the exchange to connect it with, for example external telecommunications networks.
  • the incoming cable (5) is typically terminated at a cable chamber joint (CCJ) (8) by a splice (10f) to an internal cable (1c).
  • the CCJ is typically located within same building as the equipment rack (2) although this is not necessarily the case.
  • the CCJ represents the "line-side" of the exchange for purposes of fibre routing within the exchange.
  • the equipment rack represents the "equipment-side” for purposes of fibre routing within the exchange.
  • the internal cable (1 c) is spliced at one end to the incoming cable at the CCJ, and the other end to a line-side flexibility point such as an Optical Flexibility Rack (OFR) (4d).
  • OFR Optical Flexibility Rack
  • Flexibility points serve various functions, mainly as a junction or distribution point to allow a user to select and connect a point to any other point within the exchange e.g. from any piece of exchange equipment to any other piece of equipment, or from/to an incoming cable. Flexibility points also provide an interface between the typically high fibre count incoming cable and internal cables (which may be single-fibre or may contain many fibres), terminate incoming fibres onto splice trays for safe storage, provide easy access to each individual fibre and serve as testing points. We are however for present purposes interested only in their ability to connect line-side fibre to equipment-side fibre.
  • flexibility points are used together, more usually in side-by-side pairs, to facilitate the routing of fibres within the exchange - one on the line-side and one on the equipment-side.
  • Such groupings of flexibility points are within this patent called flexibility suites.
  • "flexibility points" and “flexibility suites” in this discussion are generic references to OFRs and OFR suites for fibre cables, and to Blown Fibre Tube Flexibility Modules (BFTFMs) and BFTFM suites (discussed below in connection with Figure 3 onwards).
  • OFR suites (4a and 4b, 4c and 4d) allow fibres terminated in line-side flexibility points and equipment-side flexibility points to be spliced to each other on a splice tray dedicated to a fibre or pair of fibres.
  • Fibre jumpers (3a, 3b) are spliced between the pair of OFRs which typically make up a suite.
  • Another fibre cable (1b) connects an equipment-side OFR (4c) to the next line-side OFR (4b).
  • the first OFR suite (comprising 4c and 4d) in Figure 1 is located near the CCJ, and the last suite (comprising 4a and 4b) is that located near the destination equipment rack.
  • a number of OFR suites distribute and route optical cable; the "last OFR suite" (comprising 4a and 4b) would be the suite located closest to the destination equipment rack (2).
  • FIG. 1 depicts the most basic layout involving two pairs of OFRs (i.e. two suites).
  • any number of OFR suites can be used to describe the optical path to the equipment rack, which would have an effect on the number of splices or connections in the optical path.
  • a minimum of six splices (10a to 10f) is required.
  • Figures 2A and 2B illustrate how, according to current practices, an optical path is rerouted from a first equipment rack (2) to second equipment rack (12) in a conventional optical fibre installation.
  • an optical path connects the incoming cable (5) to the existing equipment rack (2).
  • the splice at the OFR (10e) will have to be broken in the old path.
  • the other splices along the old path (10a to 10d) could be broken if required.
  • Figure 2B shows the optical path to the new equipment rack (12) through two OFR suites (4). Five new splices (10h to 10l) are made to create the new optical path from the line side OFR (4d) adjacent to the CCJ (8).
  • FIG 3 shows a first embodiment of the invention.
  • a blown fibre unit (BFU) is installed from the OFR (4) to the equipment rack (2) to effect the connection between the incoming cable (5) and the equipment rack (2).
  • the incoming cable (5) is terminated at a first line-side OFR (4) in the usual way as described in connection with Figure 1 above.
  • An internal cable (1) is spliced to the incoming cable at the CCJ and will be spliced at its other end on a splice tray housed in a conventional line side OFR (4) in the usual way as described in connection with Figure 1 above.
  • BFT blown fibre tube
  • BFTFMs Blown Fibre Tube Flexibility Modules
  • Suitable push-fit connectors can be obtained from the John Guest company.
  • BFTFMs are flexibility points allowing the production, within the exchange building, of a blown fibre installation path from any point to any other point by routing and joining lengths of blown fibre duct.
  • BFTFMs will most commonly be employed in pairs, or suites, one on the line-side (14b) and one on the equipment-side (14a).
  • the OFR (4) at which the internal cable (1) is spliced forms one half of a flexibility suite, the other half of the suite being a BFTFM (14c) on the equipment side.
  • This flexibility suite As the primary flexibility suite.
  • the primary flexibility suite could also comprise two BFTFMs (as opposed to an OFR and a BFTFM).
  • the main function of the OFR in the primary flexibility suite is to receive the incoming cable (5), which could comprise up to e.g. 144 fibres, and provide a break out point for the individual fibres of that cable. It is possible for the individual fibres of the incoming cable to be broken out at, for example, a CCJ (8), or at any point between the CCJ and the primary flexibility suite. It would not however normally be desirable so to do, as this would mean bringing up to e.g. 144 individual fibres to the primary flexibility suite for treatment. For the purposes of this description therefore, the primary flexibility suite will be discussed as being an OFR-BFTFM pair although it should be understood that this is not the only arrangement possible.
  • the BFTs (16a, 16b) in this embodiment are installed between one equipment-side BFTFM to the next line-side BFTFM along the path to the equipment rack.
  • the path is completed by installing BF patch tubes (17a, 17b) within the flexibility suites (14c and 4, 14a and 14b), so that a completed BFT path is created between the OFR (4) and the equipment rack, ready to receive a blown fibre unit (BFU).
  • BFU is then installed by blowing from one or other end of the path, i.e. from the equipment rack (2) or from the first OFR (4).
  • EPFU Enhanced Performance Fibre Unit
  • the BFT or duct used as patch tubes typically has an internal bore diameter in the range 1.5 to 5mm, more usually between 2.0 and 4mm, especially 2.5 to 3.5mm.
  • a particularly preferred bore diameter is 2.5mm, and a tube with this bore size can conveniently be made to have an outer diameter of 4mm.
  • the use of circular internal cross sections is not essential, nor is the use of circular external cross sections although these will often be used.
  • the fibre unit to be used will contain only a single fibre, but there will be occasions where higher fibre counts will be used.
  • fibre units can be made more stable if they contain an even number of fibres, for example 2-fibre, 4-fibre, 8-fibre, but odd-fibre counts can of course be used.
  • the use of fibre units with multiple fibres may, for example, be useful where the multiple fibres are to be terminated at the same destination rack and/or where they serve the same customer.
  • Figure 3 shows just two flexibility suites in use, but as discussed above, further flexibility suites can be employed depending on the physical distance, building layout and path taken from the originating point to the destination point.
  • the installation could involve the following steps:
  • Figures 4A and 4B show how an optical path connecting an incoming cable (5) to an existing equipment rack (2) can be changed to the new equipment rack (12) in accordance with the invention.
  • Figure 4A shows the existing optical path between the incoming cable (5) and the old equipment rack (2) though two flexibility suites (14).
  • Figure 4B shows how only two splices (10a, 10b) have to be broken in the existing optical path, which compares favourably with equivalent under the conventional method which requires five breaks (see Figure 2 ).
  • the blown fibre unit is removed.
  • the path is then re-configured, using BFT (16) between flexibility suites (14d and 14e, 14c and 4), and single tube BFT patch leads (17c, 17d) between the flexibility points within a suite.
  • BFU is then installed as described above in connection with Figure 3 , by blowing from one or other end of the path, i.e. from the new equipment rack (12) or from the OFR (4). Only two new splices are made (10c, 10d), at the OFR and the new equipment rack.
  • yet another advantage of the invention is flexibility in re-routing and user-friendliness, compared to conventional techniques requiring installation of heavy cables.
  • Figures 5 and 6 show refinements of the arrangements described in Figure 3 above, being embodiments of the invention which further reduce the number of splices required.
  • the arrangement in Figure 6 allows a connection between the equipment rack (2) and the incoming cable (5) with just a single splice (10) at the OFR (4).
  • BFT is installed directly from the equipment rack to the equipment side of the BFTFM located nearest to the equipment rack (14a).
  • BFU is installed in the manner discussed above with reference to Figure 3 .
  • the following are typical steps that can be taken to create this installation where the incoming cable enters the building in the basement, the primary flexibility suite (4) is on the ground floor and the equipment rack is located on the first floor:
  • FIG 7 shows an embodiment of a BFTFM (14).
  • This has a patching panel (11), shown here with no connectors, although these would generally be provided, in double-ended form (as for example shown in Figure 14 ), within each of the holes shown in the panel 11.
  • a set of bend control vanes or mandrels 24 one for each of the connector sites in the panel 11. It will be seen that these are configured to receive tubes which approach the BFTFM from the left, the tubes then being bent down to reach a connector site on the panel 11.
  • These tubes could be the patching tubes or they could be tubes coming from an earlier suite or going to a later one.
  • the other ends of the connectors when fitted into the panel 11, face downwards and tubes (typically patching tubes) are mated to these connectors and then lead on to connectors of another BFTFM (typically the one that provides the other part of the same suite).
  • the arrangement shown in Figure 7 is intended to be used with a matching BFTFM as shown in Figure 7B .
  • the patching tubes typically pass down and out through the aperture 99 at the back of the BFTFM.
  • the curved faces of the three-sided structure shown generally as 77 serves to provide a bending mandrel for the patch tubes that join the two BFTFM of the suite.
  • the end portions 76 and 78 provide some lateral confinement of the patch tubes as well as providing another curved guiding mandrel.
  • the bend management mandrels 24 are provided as a unitary structure to suit a particular size of patching panel. Also, it is preferable if the bend management mandrels or the assembly of these can be fitted in either hand, that is to accept tubes from left of the suite or from right of the suit.
  • a bend mandrel arrangement or assembly could be provided to accept tubes both from the left and from the right (that is, in Figure 7 the left hand part of assembly 24 could be as shown, while the right hand part could have the mandrels or vanes with a bend towards the right (e.g. the mirror-image of the left).
  • such an arrangement need not be symmetrical, with the left half of the mandrels bending left and the right half bending right, but could be arranged one-third two-thirds or one-fifth four-fifths, for example.
  • a BFTFM occupies about the same area and space as an existing OFR or other generic flexibility rack currently used in exchanges, for ease of replacement.
  • BFTFMs will be approximately 1000cm wide, 400cm deep and 830cm tall.
  • This build of BFTFMs is expected to be stacked up three modules high each on the line- and equipment sides, as shown in Figure 7F , to occupy a total height of about 2500cm. It is of course possible to size and configure the BFTFMs according to the particular requirements of the situation.
  • BFTFMs incorporate positive tube bend management (e.g. the mandrels 24) for optimised BFU installation. Further discussion of this technique is provided below in the discussion of Figures 10 and 11 , but in brief this helps prevent installed optical fibres from being bent at less than their minimum permissible bend radius.
  • Figures 7A to 7F show possible build configurations of the BFTFM of Figure 7 into BFTFM suites, from a single module to a six-module build. While a single BFTFM may be used as a flexibility point, multiple-modules are preferred (e.g. to provide one or more suites) and their modularity allows flexibility in use and scope for expansion.
  • Figure 7A shows a single module BFTFM. Two versions are available that respectively allow cable entry from left or right. The example shown allows cable to be fed from the left. A single unit like this would be mounted on the back of a flexibility point such as an OFR to provide the first building block of flexibility suite, in particular the suite most adjacent to the CCJ or the incoming cable.
  • a flexibility point such as an OFR
  • Figure 7B shows two BFTFM modules mounted back to back to create a flexibility suite with a line-side and an equipment-side. Generally, two modules are the optimum to provide line and equipment side flexibility.
  • Figure 7C shows a further BFTFM module mounted on top of the arrangement of Figure 7B .
  • Such an arrangement may be required for example, where there is uneven growth of the demand for the equipment-side modules, compared to that for line-side modules.
  • Figure 7D shows that further build can also be carried out to the side from one end of the suite. In this case as cable entry is from the left-hand side, further modules would be added to the right.
  • Figures 7E and 7F show five- and six-module configurations to illustrate the potential for growth in the use of BFTFMs.
  • the drawing on the right in Figure 8 depicts another view of a suite of BFTFMs (14) partly populated with blown fibre patch tubes (17).
  • This is a three-high build of line-side and equipment-side modules.
  • the BFTFMs perform a junctioning or distribution function to allow users to make connections between points in an exchange.
  • the BFTFMs include a patch panel (11) comprising patching tube connectors (13).
  • the ends of the patch tubes are push-fit into the receivers to define connection paths.
  • the patching panel comprises 19 tube connectors across and 14 deep in a grid or matrix formation or array.
  • the patch panels of the pair of BFTFMs allow a user considerable scope and flexibility in directing and re-directing fibre connections within the exchange.
  • fibre can then be blown along the path from source (e.g. an incoming cable 5) to destination (e.g. an equipment rack 2) - or in the opposite direction - via the BFTFM(s).
  • source e.g. an incoming cable 5
  • destination e.g. an equipment rack 2
  • the fibre connection can be easily removed and/or redirected by withdrawing the fibre from the tube path, pulling out the tubes from the tube connector in the relevant BFTFM, and then if required by repeating the above steps to create the path from the new source or to the new destination.
  • FIG. 8 The schematic diagram on the left in Figure 8 shows the side view of the BFTFM suite (shown on the right of the same page and discussed above), with details of the tube patching between the patching panels located on each BFTFM. It can be seen that the patching tubes exit the connectors 13 downwards. In the suite on the lower level of the assembly, patch tube link the front and back (or, as shown, the left and right) of the suite. It can also be seen that the top right BFTFM has been interconnected with the middle-left BFTFM using a patching tube. Similarly, each of the middle tier of BFTFMs is connected to the lowest tier of the stack. Clearly the figure is merely illustrative and in general much higher densities of patch tube connection will be used in real life.
  • the paths of the patching tubes (17) can be traced between the different levels of BFTFMs in the figure.
  • FIG. 9 shows a typical build sequence for the installation described in Figure 6 above using a generic type of OFR. The following steps accord with the numbering against the drawings:
  • the secondary flexibility suite is now ready to accept BF tubing.
  • the installation shown can accommodate up to 384 BF patch tubes.
  • optical fibre is a particular problem in large telecommunications exchanges.
  • British Telecommunications plc has to date more than 4,000 exchanges throughout the United Kingdom, of which some 200 serve over 20,000 customers each.
  • the largest exchanges have multiple floors, hundreds of equipment racks and a very high number of fibre and copper cables routed around and throughout the exchange building.
  • the exchange becomes more heavily populated and changes to equipment, customer needs etc., necessitate re-routing and re-termination of cables. It has been found that the routes taken by cables, if uncontrolled, may impair the performance of the optical fibre.
  • Figure 11 shows the BFTFMs discussed in connection with Figure 9 above, and illustrates how the technique of positive tube bend management may be used.
  • Figure 11A and 11B show where cable bend can be controlled and managed (40) in a typical BFTFM set-up.
  • Tube bend management apparatus can take the form of curved guides or mandrels - (e.g. 124 in Figure 9 ) - around or against which the tubes are wrapped.
  • the degree of curve depends on the exact type of cable tube being used but in the UK this would typically be a radius of about 50mm.
  • Figures 11C and 11 D show where and how tubes (16) can be subject to positive tube bend management in a BFTFM of the type discussed in connection with Figure 9 .
  • the bend control mandrels (124) allow the optical fibre (16) to be guided in a controlled manner around a curve of a radius suitable for it, preventing overly tight cable routing.
  • Figure 12 provides details of one application of positive tube bend management on the BFTFM.
  • On the right side of this figure is a close-up view of an embodiment of a patching unit on a patching panel (11).
  • Other means for controlling fibre bend radius include the use of bend limiting tube (or bend-limiting boots on an ordinary tube); selection of tube sheath materials (i.e. using stiffer or more rigid materials); and thicknesses can which discourage excessive bend (i.e. using wall thicknesses which at the lengths typically used for patching are much less likely to be bent at a radius which represents an excessive bend); and so on.
  • guides (15) are positioned on or next to the tube connectors to accommodate and control the bend radius of tube and fibre passing through the receivers. These help to prevent the type of overbend depicted in Figure 10 .
  • Figure 13 depicts another, preferred embodiment of the patching unit of the invention, as mounted onto a BFTFM.
  • the unit comprises two main parts, the first being a connector body (19) configured to receive a BFT (17) entering (or exiting) the module, and the second being the tube connector (13) fitted to the body.
  • the connector body includes a channel shaped and functioning as a guide (15) to prevent BFT and fibre overbend.
  • BFTs are push-fit on the tube connectors (13).
  • the tube connector is fixed to the connector body (19), and only one of the two receiving portions (21) is visible in this Figure 13 .
  • the tube connector is shown unfixed from the rest of the patching unit and further detailed in Figure 14 . It essentially comprises a connector tube (23) with two receiving portions (21), one each on opposite ends of the connector tube.
  • the patching units When installed on the BFTFM, the patching units form a matrix on the patching panel (11) allowing a user to create a tubular path between two BFTFMs, and thus in the broader context of the exchange, to form part of the tubular path between the incoming cable (5) and the destination equipment rack (2).
  • Figure 15 Another view of this embodiment of the patching unit is shown in Figure 15 , which show the patching unit mounted on a BFTFM, and the part of the path taken by the BFT (17) through the tube connector (13).
  • the tubes in the present embodiment are connected on the patch panel in a push-fit arrangement.
  • clamped or screw-down connectors could be used as could, for example, gluing or welding to fix and seal the tubes to the patch panels - although such permanent or semi-permanent would compromise the re-routing flexibility which the invention potentially provides.
  • Figure 15 shows the patching unit sitting in a position provided for it in the patch panel of the BFTFM so that its arms (25) point upwards, and the tube connector (13) downwards.
  • a BFT ultimately leading from or to the incoming cable (5) or the equipment rack (2) is positioned so that it lies on the connector body between the connector arms.
  • the channel acting as a guide (15) leads the BFT to the tube connector (13) and prevents cable overbend.
  • the BFT is push-fit onto the receiving portion (21) of the tube connector (13) located at the end of the channel (not visible from the drawings).
  • the other tube connector on the opposite end of the connector unit may simultaneously or separately receive another length of BFT to continue the tubular path away or from the BFTFM.
  • the foregoing discussion concerns mainly a connection created by the invention between an equipment rack and an incoming cable connecting the exchange to the external telecommunications network
  • the skilled person would easily recognise that the invention can be deployed with similar effects or advantages to connect any other originating point to any destination point within or outside of the exchange.
  • the invention can have applications in any other environment where blown fibre technology according to the invention can be used in place of conventional connectorised and/or spliced optical fibre or current BFT management practices.
  • the invention may be used in a Local Area Network (LAN) environment.
  • LAN Local Area Network
  • the invention is not limited to use in a new set-up ready to be cabled, nor to one which is already cabled in a manner as described herein.
  • the inventive aspect concerning re-routing of optical paths, in particular, can be applied even in a conventional installation, to gradually migrate the inventive method into such convention set-ups.
  • the benefits of using the invention can be realised even in such applications.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Claims (18)

  1. Flexibilitäts-Gruppe zum Routing von optischen Fasern innerhalb einer Telekommunikations-Switch-Installation zwischen einem ankommenden Kabel (5) und einem Ausrüstungs-Rack einer Vielzahl von Ausrüstungs-Racks (2, 12), wobei die Flexibilitäts-Gruppe umfasst:
    einen ersten Flexibilitätspunkt (14a) und einen zweiten Flexibilitätspunkt (14b), wobei mindestens einer der Flexibilitätspunkte mit einem Fasereinblasrohr-Flexibilitätsmodul (14) ausgerüstet ist, wobei der erste Flexibilitätspunkt ein Patchpanel (11) enthält, das eine Vielzahl von Leerrohren aufweist, wobei jedes Leerrohr der Vielzahl von Leerrohren ein erstes Ende und ein zweites Ende besitzt und die ersten Enden in einer ersten Anordnung und
    die zweiten Enden in einer zweiten Anordnung angeordnet sind, und
    wobei der zweite Flexibilitätspunkt ein Patchpanel (11) enthält, das eine Vielzahl von Leerrohren aufweist, wobei jedes Leerrohr der Vielzahl von Leerrohren ein erstes Ende und ein zweites Ende besitzt und die ersten Enden in einer dritten Anordnung und die zweiten Enden in einer vierten Anordnung angeordnet sind, wobei die Flexibilitäts-Gruppe zum Routen von optischen Fasern so ausgebildet ist, dass sie im Einsatz ermöglicht, eines der zweiten Enden in der zweiten Anordnung mit einem der ersten Enden in der dritten Anordnung durch Patchrohre (17) zu verbinden, so dass durch Verbinden von ausgewählten Enden der Leerrohre in der zweiten und
    der dritten Anordnung ein durchgehender Rohrpfad zwischen einem der ersten Enden in der ersten Anordnung und einem der zweiten Enden in der vierten Anordnung gebildet werden kann, der die Installation einer einzelnen, nicht gebrochenen optischen Faser durch den durchgehenden Rohrpfad erlaubt, wobei das Fasereinblasrohr-Flexibilitätsmodul (14) mit Biegeflächen (77) zur Biegekontrolle und zur Führung von Fasereinblasrohren ausgerüstet ist.
  2. Flexibilitäts-Gruppe wie in Anspruch 1 beansprucht, bei der die Patchrohre vorhanden sind und Leerrohr-Enden in der zweiten und der dritten Anordnung verbinden, wobei das mindestens eine Fasereinblasrohr-Flexibilitätsmodul (14) mit mindestens einer Biegefläche (77) versehen ist, die zur seitlichen Begrenzung der Patchrohre ausgebildet ist.
  3. Flexibilitäts-Gruppe wie in Anspruch 1 oder Anspruch 2 beansprucht, bei der das mindestens eine Fasereinblasrohr-Flexibilitätsmodul (14) ferner Leitflügel (24) zur Biegekontrolle und zur Führung von Fasereinblasrohren zu oder von den ersten Enden in der ersten Anordnung oder den zweiten Enden in der vierten Anordnung aufweist.
  4. Flexibilitäts-Gruppe wie in einem vorhergehenden Anspruch beansprucht, bei der jedes Leerrohr der Vielzahl von Leerrohren mit einem zweiseitigen Verbinder (13) versehen ist, der ein Verbinderrohr (23) aufweist, das an jedem Ende Aufnahmeteile (21) zur Verbindung des entsprechenden Leerrohr-Endes mit einem Patchrohr besitzt.
  5. Flexibilitäts-Gruppe wie in einem der Ansprüche 1 bis 4 beansprucht, bei der die Innendurchmesser der Leerrohre und der Patchrohre 1,5 bis 5 mm betragen.
  6. Flexibilitäts-Gruppe wie in einem der Ansprüche 1 bis 5 beansprucht, bei der die Innendurchmesser 2 bis 4 mm betragen.
  7. Flexibilitäts-Gruppe wie in einem der Ansprüche 1 bis 6 beansprucht, bei der die zweite und die dritte Anordnung oder die erste und die vierte Anordnung nebeneinander angeordnet sind.
  8. Telekommunikations-Switch-Installation oder Telekommunikations-Router-Installation, die einen Telekommunikations-Switch oder Telekommunikations-Router aufweist, der umfasst:
    eine erste und mindestens eine zweite Flexibilitäts-Gruppe nach einem der Ansprüche 1 bis 7,
    einen rohrförmigen Teilpfad, der durch jede der Flexibilitäts-Gruppen von der ersten Anordnung zu der vierten Anordnung über ein Patchrohr (17) zwischen der zweiten und der dritten Anordnung definiert ist,
    wobei die vierte Anordnung der ersten Flexibilitäts-Gruppe mit der ersten Anordnung der zweiten Flexibilitäts-Gruppe oder einer der zweiten Flexibilitäts-Gruppen verbunden ist,
    einen rohrförmigen Pfad, der zwischen der vierten Anordnung der zweiten Flexibilitäts-Gruppe oder der letzten der zweiten Flexibilitäts-Gruppen und dem Switch oder Router (2) vorgesehen ist,
    wobei die anderen zweiten Flexibilitäts-Gruppen, falls vorhanden, mit der ersten Anordnung jeder nachfolgenden zweiten Flexibilitäts-Gruppe mit der vierten Anordnung der vorhergehenden zweiten Flexibilitäts-Gruppe mittels eines Patchrohrs (17) in Reihe verbunden sind, so dass ein im Wesentlichen durchgehender Pfad zur Installation eines eingeblasenen Faserelements zwischen der ersten Flexibilitäts-Gruppe und dem Switch oder Router bereitgestellt wird,
    wobei der Switch oder Router über eine optische Faser eines durchgehenden eingeblasenen Faserelements, das sich längs des im Wesentlichen durchgehenden Pfades erstreckt, optisch mit einer optischen Faser eines Kabels optischer Fasern verbunden ist, das von einem externen Telekommunikations-Netzwerk in die Installation eintritt.
  9. Installation wie in Anspruch 8 beansprucht, bei der die optische Faser des eingeblasenen Faserelements mit einer Faser des ankommenden Kabels (5) verspleißt ist (10b).
  10. Installation wie in Anspruch 8 beansprucht, bei der die optische Faser des eingeblasenen Faserelements mit einer Faser eines Kabels oder einer Fasereinheit verspleißt ist, die sich innerhalb des optischen Pfades zwischen dem ankommenden Kabel und dem eingeblasenen Faserelement befindet.
  11. Installation nach einem der Ansprüche 8 bis 10, die eine Vielzahl von sekundären Flexibilitäts-Gruppen enthält.
  12. Installation nach einem der Ansprüche 8 bis 11, bei der eine Vielzahl von Telekommunikations-Switchen über die Flexibilitäts-Gruppen mit optischen Fasern von mehreren ankommenden Kabeln verbunden sind.
  13. Verfahren zur Erzeugung einer Verbindung in einer Telekommunikations-Switch-Installation oder einer Telekommunikations-Router-Installation zwischen einem Telekommunikations-Switch oder Telekommunikations-Router und einer optischen Faser eines ankommenden Kabels, das mit einem Telekommunikations-Netzwerk verbunden ist und von diesem ankommt,
    das die folgenden Schritte umfasst:
    Installieren von Längen von Fasereinblasrohren und Verbinden der Enden der Längen der Fasereinblasrohre unter Erzeugung eines Pfades von einer ersten Flexibilitäts-Gruppe nach einem der Ansprüche 1 bis 7 zu dem Telekommunikations-Switch über eine zweite Flexibilitäts-Gruppe nach einem der Ansprüche 1 bis 7 und
    danach Installieren einer durchgehenden eingeblasenen Fasereinheit mittels Einblasens durch den Pfad hindurch, der durch die verbundenen Fasereinblasrohre gebildet wird, um einen optischen Pfad zwischen dem Telekommunikations-Switch und der optischen Faser des ankommenden Kabels zu erzeugen.
  14. Verfahren zum Re-Routing einer bestehenden Verbindung in einer Telekommunikations-Switch-Installation oder einer Telekommunikations-Router-Installation von einer Verbindung zwischen einem ersten Telekommunikations-Switch oder Telekommunikations-Router und einer ersten Flexibilitäts-Gruppe nach einem der Ansprüche 1 bis 7 zur Erzeugung einer Verbindung zwischen einem zweiten Telekommunikations-Switch oder Telekommunikations-Router und der ersten Flexibilitäts-Gruppe, das die folgenden Schritte umfasst:
    Lösen der Verbindung zwischen dem ersten Telekommunikations-Switch und der ersten Flexibilitäts-Gruppe, Verbinden der Enden von Längen von Fasereinblasrohren unter Erzeugung eines Pfades von einer ersten Flexibilitäts-Gruppe zu dem zweiten
    Telekommunikations-Switch über eine zweite Flexibilitäts-Gruppe nach einem der Ansprüche 1 bis 7 und danach Installieren einer durchgehenden eingeblasenen Fasereinheit mittels Einblasens durch den Pfad hindurch, der durch die verbundenen Fasereinblasrohre gebildet wird, unter Erzeugung eines optischen Pfades zwischen dem zweiten Telekommunikations-Switch oder Telekommunikations-Router und der optischen Faser des ankommenden Kabels.
  15. Verfahren nach Anspruch 13 oder 14, bei dem die erste Flexibilitäts-Gruppe einen leitungsseitigen optischen Flexibilitätspunkt (4) und einen ausrüstungsseitigen Fasereinblasrohr-Flexibilitätspunkt (14c) beinhaltet, die in Nachbarschaft zueinander angeordnet sind, und die zweite Flexibilitäts-Gruppe einen leitungsseitigen Fasereinblas-Flexibilitätspunkt und einen ausrüstungsseitigen Fasereinblas-Flexibilitätspunkt beinhaltet, die in Nachbarschaft zueinander angeordnet sind, wobei der Pfad von der ersten Flexibilitäts-Gruppe zu dem Telekommunikations-Switch erzeugt wird durch Installieren eines Fasereinblasrohrs von dem ausrüstungsseitigen Fasereinblas-Flexibilitätspunkt in der ersten Flexibilitäts-Gruppe zu dem leitungsseitigen Fasereinblas-Flexibilitätspunkt in der zweiten Flexibilitäts-Gruppe, Installieren eines Fasereinblasrohrs von dem ausrüstungsseitigen Fasereinblas-Flexibilitätspunkt in der zweiten Flexibilitäts-Gruppe zu dem Telekommunikations-Switch und Verbinden des leitungsseitigen Flexibilitätspunktes mit dem ausrüstungsseitigen Flexibilitätspunkt in der zweiten Flexibilitäts-Gruppe.
  16. Verfahren nach einem der Ansprüche 13 bis 15, bei dem die durchgehende eingeblasene Fasereinheit durch Einblasen von einem Ausrüstungs-Rack installiert wird, in dem der Telekommunikations-Switch untergebracht ist.
  17. Verfahren nach einem der Ansprüche 13 bis 16, bei dem die durchgehende eingeblasene Fasereinheit mit einem Verbinder vorverbunden wird.
  18. Verfahren nach einem der Ansprüche 13 bis 17, bei dem die durchgehende eingeblasene Fasereinheit durch Einblasen von dem leitungsseitigen optischen Flexibilitätspunkt der ersten Flexibilitäts-Gruppe installiert wird.
EP04724642.6A 2003-03-31 2004-03-31 Verteilerschrank für glasfaserkabel Expired - Lifetime EP1609012B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB0307394A GB0307394D0 (en) 2003-03-31 2003-03-31 Telephone exchange cabling
GB0307394 2003-03-31
GB0322490A GB0322490D0 (en) 2003-09-25 2003-09-25 Exchange cabling
GB0322490 2003-09-25
PCT/GB2004/001370 WO2004088382A1 (en) 2003-03-31 2004-03-31 Optical fiber cable distribution frame

Publications (2)

Publication Number Publication Date
EP1609012A1 EP1609012A1 (de) 2005-12-28
EP1609012B1 true EP1609012B1 (de) 2017-01-04

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ID=32299721

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Application Number Title Priority Date Filing Date
EP04724642.6A Expired - Lifetime EP1609012B1 (de) 2003-03-31 2004-03-31 Verteilerschrank für glasfaserkabel

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US (2) US20060188209A1 (de)
EP (1) EP1609012B1 (de)
JP (1) JP4515449B2 (de)
KR (1) KR20060010735A (de)
AU (1) AU2004226635B2 (de)
CA (1) CA2519804A1 (de)
GB (1) GB2402280B (de)
WO (1) WO2004088382A1 (de)

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Publication number Publication date
US20080013884A1 (en) 2008-01-17
JP4515449B2 (ja) 2010-07-28
KR20060010735A (ko) 2006-02-02
AU2004226635B2 (en) 2010-04-29
GB2402280B (en) 2007-09-26
AU2004226635A1 (en) 2004-10-14
GB2402280A (en) 2004-12-01
EP1609012A1 (de) 2005-12-28
WO2004088382A1 (en) 2004-10-14
US20060188209A1 (en) 2006-08-24
CA2519804A1 (en) 2004-10-14
JP2006522355A (ja) 2006-09-28
US8837893B2 (en) 2014-09-16
GB0407334D0 (en) 2004-05-05

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